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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
I was wondering the same myself :D
Degenerate Binary Tree ;)
It must be a binary tree.
This is a spoiler (and was marked as such, not by me). This kata asks to do something different from this method.
This comment is hidden because it contains spoiler information about the solution
Such a tree doesn't exist.
It should not be 8 kyu
hatred